/Engine/Source/Runtime/Datasmith/DatasmithCore/Public/IDatasmithSceneElements.h
Creates a new surface that will be used as layer inside this composite using the texture filename and its uv element.
void AddSurface ( const TCHAR * Texture, [FDatasmithTextureSampler](API\Runtime\DatasmithCore\FDatasmithTextureSampler) TexUV )